The ‘Active Parking Assist’ from Mercedes-Benz recognizes empty parking spaces by simply passing them. That brought ad agency Jung von Matt/Neckar to the idea that if the car knows where the empty parking spaces are, then everybody could also be informed.
So just before Christmas when parking spaces were hard to find, they launched the Mercedes-Benz Tweet Fleet with its Active Parking Assist that tweeted empty parking spaces in downtown Stuttgart.
The MBTweetFleet cars automatically generated the tweets with GPS data via Arduino an onboard electronic and a PHP Relay. People could then follow @MBTweetFleet to find empty parking spaces near them on twitter and be navigated there by the linked Google map.